Printing-plate clamp



W. M. EVENSEN.

PRINTING PLATE CLAMP. APPLICATION FILED NOV-6,1917. RENEWED JAN. 8. 1919.

1,350,01 5. Patented g- 17, 1920.

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UNITED STATES PATENT OFFICE.

WILLIAM M. EVENSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOSS PRINTING PRESS COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PRINTING-PLATE CLAMP.

I Specification of Letters Patent. Patented Aug. 17, 1920.

Application filed November 6, 1917, seriainb. 200,501. Renewed January 8, i919. Serial No. 270,213.

To all whomit may concern:

Be it known that 1, WILLIAM M. EVEN SEN, a citizen of the United States,'residing at Chicago, county of Cook, and State of Illinois, have invented certain .new and useful Improvements inv Printing- Plate Clamps, of which the following is a specification. V i

The invention relates to adjustable plate clamps, such as are used in positioning and holding .in position electrotype, stereotype and other plates upon the cylinderor other form bearing member of'a printing press.

The invention consists in the novel artiparts, constructions, arrangements, combinations and improvements herein shown and described.

The objects and advantages of the invention will be set forth in part hereinafter, and in part will be obvious herefrom, or may be learned by practice with the invention; the same being realized and attained through the means, instrumentalities and combinations pointed out in the appended claims. V

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description serve to illustrate the principles thereof.

Of the drawings:

Figure 1 is a side elevation of the clamp in place in a slot in the press bed and engaging the plate, the plate and bed being Fig. 5 is an isometric detail of the wedge piece cooperating with the clamp body.

Referring more particularly to the accompanying drawings, illustrating by way of example the present preferred embodiment of the invention, the clamping jaw or plate engaging member 1 is provided with an undercut edge 2, adapted to take over and engage with the beveled edge 3 of the plate 4:, which plate rests upon the bed 5 of I downwardly into the slot 7 in the bed 5.

The body 6 of the clamp is formed in its upper part to substantially fill the slot 7, the slot being preferably undercut or dovetailed, being widerin cross section at the bottom than the top, and having its sides sloping. uniformly upwardly toward each other.

In the upper portion of the body 6 is an internally screwthreaded hole 9 adapted to receive the serewthreads on the body 10 of the clamping screw. The clamping screw is provided with an enlarged, conically shaped head 11, which head is at the lower end and within the slot 7 in the bed plate. The tip or upper end of the screw is providedwith a slot 12, by which a screw driver may be employed to turn the screw and thus move it upwardly and downwardly with respect to the body 6 of the plate clamp. The body of the plate clamp, in the downwardly depending portion 13 is cut out hemi-conieally, or formed to fit closely the tapered or conical head of the clamping screw (see Fig. 3).

The clamp body (3 is longitudinally recessed substantially centrally from the bottom upwardly for a portion of the depth of the body and then outwardly to one side.

The expanding member rests within this re cess and is approximately of the same shape as the recess. The clamp body and expanding member are forced apart to fix the clamp in position in the slot. The expanding member 14 which cooperates with the clamp body as stated to hold the clamp in position in the slot, as embodied consists of an elongated member or bar shaped substantially in cross section to fit into the recess in the slot betweenthe upper portion and the downwardly depending portion of the clamp body, and preferably of the same lengthwith the body of the clamp. This cooperating clamping or expanding member is shaped or hollowed on its inner side at. 15 into hemi-conical form to cooperate with the tapered or conical head 11 of the expanding screw.

The operation of the clamp will be readily understood. A screw driver is inserted into the slot 12 of the expanding screw, which is always accessible from the top of the clamp. As the screw is turned and thus 50 upright faces of the body "and expanding member having corresponding hemi-conical' moves upwardly, the conical head 11 there of drives the cooperating expanding mem ber lit away transversely from the body or the clamp, thereby firmly wedging the clamp'in the groove in the bed. By turning the screw in the opposite direction, the clamp is loosened and may he slid along the groove.

The 'clampis of ajvery simple andsturdy constructiom having 'but two parts besidesthe screw. The cooperating clamping mem bers are simple, solid and strong. Thebody oflthe clamp is very large, occupying the greater part of the cross-sectional space in the groove in the plate bed, and the cooperating expanding member is also simple and strong; The clampbody andhead being 1Iltegral gives'a very strong construction, and

the'large" size of the clamping'body also serves to protect it during the hard usage given to clamps by many pressmen, as for instance driving clamps along the groove after they have been screwed up quite tightly into clamping position. lhe clamp 5 ing screw cannot come out'of the clamp and cause damage to the press or plates. There is also'great advantagein the utilization of the-headless screws, as the breaking off-oi the screwheads with consequent damage of the press or plates, and the screw is at all times insideof the clamp. Other advantages will be obvious herefrom or may be learned by practice with the invention.

It will be understood that changes may bei'n'ade from'the details of construction as shown and described, within the scope of the accompanying claims, without departing from the principles of the invention and without sacrificing its chief advantages.

WVhat I claim as my invention and desire to secure by Letters Patent is: 1

1. A printing plate clamp adapted to cooperate with a slotted plate bed, and including in combination a clampingjaw, a clamp recesses therein terminating in a screw threaded aperture through the'clamp body,

and an expanding screw having a conical head in said hemi'conical recess and its shank threaded into the screw-th readed-- aperture in the clamp body.

2; A printing plate clamp adapted to cooperate with a slotted plate bed, and including in combination a clamping jaw, a clamp body attached thereto outwardly tapering awayfrom the'clamp and extending into slot in the bed, the clamp body" being longitudinally recessed from the center thereof 7 to one side,'an expanding membersubstan tially of the shape of the recess in the clamp body and: located. in said recess,; the jfldjll cent upright facesof. the body and expanding member having corresponding hemiconical recesses therein terminating in a screw-threaded aperture, through the clamp bOdJfyfLIld an expanding screwfhalving a" conical head in said hemi-conicalrecess and aperture in the clamp body.

its shank threaded into'the screw-tlireaded" 3. A printing plate clamp'adaptedto co operate witha slotted bed and comprisinga clamping aw, a clamp body infixed relation theretof'and extending into a slot 'inthel bed, a vertically disposed expandingscrewj threa dedin'the clamp b'ody,"and an ex ana V ing member in'the slot beside the'clamp body and directlyengaged by the screw tohold' thefclampfin position in the slot.

4'. {A printing plate clamp adapted tof'co I operate with a slotted'bed and comprising a clamping jaw, clamp body 'in'fixed relation thereto and extending 'into' a slot in the bed, a vertically disposed expanding screw threaded in the clamp body, and an expand ing member partly beneath and partly along side the clamp body and acted upon by the screw to cooperate with the clamp'bodyto hold the clamp'in'positionin the slot;

5. A'j'printing plate clampadapted to co operatewith a slotted bed andfcomprising only three separate parts, including a clamp;

ing aw,a 'clamp'body in fixed relation thereto'and extending into a slot in'fth'e bed, a vertically disposed expanding screw threaded in the clamp body, and having an enlarged head at-the bottom thereof, and an I expanding member in the slot beside the clampbocly, the screw head directly engaging the clamp bodyand" an "expanding member to effect the expanding action for holding'the clamp in position in the slot;

'61-:A printing plate clamp adapted to co operate with a slotted bed and comprising a clamping jaw, a clamp body attached there to and extending into a slot. in the bed, a

' vertically disposed expanding "screw'thread ed in the clamp body, and having a conical head at the bottom thereof, and anexpa'nding member in the slot beside the clamp 7 body, the clamp body and 'expanding'members having hemi c'onical-ly shaped portions;

cooperating with the conical screw head, the

screw head directly engaging the clamp body and expanding member toeffecttheex panding action for'holding the clamp Zinepositionin the slot;

7. A printing plate clamp adapted to'co V operatejwith a s'lott'edb'ed and comprisinga clamping'jaw, a clamp body infixedrelatiori thereto and extending into "a slot 5 in the bed, a vertically disposed expanding screw threaded in the clamp body and having turningmeans at its'upper end at the top ofthe clamp body, and an expanding member in the slot beside the clamp body and directly engaged by the screw to hold the clamp in position in the slot.

8. A printing plate clamp adapted to cooperate with a slotted bed and comprising a clamping jaw, a clamp body in fixed relation thereto and extending into a slot in the bed, a vertically disposed expanding screw threaded in the clamp body, and having turning means at its upper end atthe top of the clamp body, and having an'enlarged head at the bottom thereof, and an expand the bottom thereof, and an expanding memher in the slot beside the clamp body, the

.clamp body and expanding members having hemi-conically shaped portions cooperating with the conical screw head, the screw head directly engaging the clamp body and expanding member to effect the expanding action for holding the clamp in position in the slot.

10. A printing plate clamp adapted to cooperate with a slotted bed, and including in combination a clamping jaw, a clamp body attached thereto and extending into a slot in the bed, the clamp body being longitudinally recessed from the center thereof to one side, an expanding member substantially of the shape ofthe recess in the clamp body and located in said recess, the adjacent upright faces of the body and expanding member having corresponding hemi-cylindrical recesses therein and a vertically disposed screw-threaded aperture through the clamp body, and an expanding screw having a conical head at its bottom cooperating with said hemi-cylindrical recesses and threaded in the aperture in the clamp body and having turning means at its upper end at the top surface of the clamp body.

11. A printing plate clamp adapted to cooperate with a slotted bed and including in combination a clamping jaw and a clamp body in fixed relation to the jaw and extend ing backwardly from the plate engaging edge thereof and extending into the slot bed, a vertically disposed expanding screw threaded in the clamp body, and an expanding member in the slot beside the clamp body and directly engaged by the screw to hold the clamp in position in the slot.

12. A printing plate clamp adapted to cooperate with a slotted bed and including in combination a clamping jaw and a clamp body in fixed relation to the jaw arranged at right angles to and extending backwardly from the plate engaging edge thereof and extending into the slot bed, a vertically disposed expanding screw threaded in the clamp body, and an expanding member in the slot beside the clamp body and directly engaged by the screw to hold the clamp in position in the slot.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

XVILLIAM M. EVENSEN.

WVitnesses G. C. ABBOTT, E. H. GRAHAM. s. 

